/*
 *  Copyright 2009 Advanced Industrial Science and Technology (AIST).
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

/*! \file
 *  \brief
 */
#pragma once

#include <thrust/graph/detail/adjacency_iterator.hpp>

#include <thrust/detail/device/dereference.h>
#include <thrust/iterator/iterator_traits.h>

namespace thrust {

template <typename Graph
          , typename Vertex
          , typename OutEdgeIter>
struct adjacency_iter;
  
namespace detail {
  
struct adjacency_iter_friend
{
  template <typename Graph
            , typename Vertex
            , typename OutEdgeIter>
  static inline __device__
  typename device::dereference_result<adjacency_iter<Graph
                                                     , Vertex
                                                     , OutEdgeIter> >::type
  dereference( const adjacency_iter<Graph,Vertex,OutEdgeIter>& iter)
  {
    return iter.dereference( thrust::called_from_device_tag());
  }
};

namespace device {
  
template<typename Graph, typename Vertex, typename OutEdgeIter>
struct dereference_result< adjacency_iter<Graph,Vertex,OutEdgeIter> >
{
  typedef typename thrust::iterator_traits< adjacency_iter<Graph
                                                           , Vertex
                                                           , OutEdgeIter
                                                           > >::reference type;
};
  
template<typename Graph, typename Vertex, typename OutEdgeIter>
inline __device__
typename dereference_result< adjacency_iter<Graph,Vertex,OutEdgeIter> >::type
dereference( const adjacency_iter<Graph,Vertex,OutEdgeIter>& iter)
{
  return adjacency_iter_friend::dereference( iter);
}
  
  
} // end namespace device
  
} // end namespace detail

} // end namespace thrust
